An absorption-type air conditioner system using lithium bromide solution as absorbent is provided, which has a small volume and compact structure. The system includes upper vessel 26, lower vessel 27, cooling heat exchanger 10, self-induced air circulation device 11, outdoor system controller 9 and water heater 8. Upper vessel 26 includes high temperature generator 1, low temperature generator 2 and condenser 3. The lower vessel 27 includes high temperature heat exchanger 4, low temperature heat exchanger 5, evaporator 7 and absorber 6. Upper vessel 26 is connected to lower vessel 27 by refrigerant water outlet pipe 28, LTG dilute solution inlet pipe 29, LTG concentrate solution outlet pipe 30, HTG dilute solution inlet pipe 31, HTG concentrate solution outlet pipe 32, HTG steam outlet pipe 56, heating steam switch valve 55 and HTG steam inlet pipe 57. The system is an ideal central air conditioner system for large houses.